How many bags make one cubic yard?
One cubic yard is 27 cubic feet. Divide 27 by the bag’s mixed yield and round up. With zero allowance, that is 45 bags at 0.60 ft³ per bag or 60 bags at 0.45 ft³ per bag. Adding 10% increases those counts to 50 and 66.
How many bags make one cubic metre?
One cubic metre is 1,000 litres. A product that yields 10 L per bag takes 100 bags for 1 m³ before allowance. At 14 L per bag, round 1,000 ÷ 14 up to 72 bags.
Concrete bags per cubic yard
| Bag size | Mixed yield | No allowance | 10% extra |
|---|---|---|---|
| 40 lb | 0.30 ft³ | 90 | 99 |
| 60 lb | 0.45 ft³ | 60 | 66 |
| 80 lb | 0.60 ft³ | 45 | 50 |
Worked metric example · 0.35 m³
A small pour needs 350 L before allowance. Add 10% to get 385 L. With a 10 L yield, 385 ÷ 10 = 38.5, so buy 39 bags. With a 14 L yield, 385 ÷ 14 = 27.5, so buy 28 bags. Both counts refer to the same pour. The difference comes from the product’s yield.
Round after adding the allowance
For one pour mixed from the same product, add the volume of every section first. Add the allowance once, divide by the yield, and round up once. Set the allowance to zero if the volume you entered already includes it.
Presets use approximate mixed yields from QUIKRETE, Australian Builders, and SAKRETE Canada. For other products, use the mixed yield on the label.
Start with the concrete volume calculator if you know the dimensions. For holes around buried posts, use the fence post calculator. For delivered material, use the ready-mix quote guide.